<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>案例</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        body{
            background-image: url('img/minren.jpg');
            background-size: cover;
            background-attachment: fixed;
        }
        div{
            width: 400px;
            height: 1000px;
            background-color: yellow;
            margin: auto;
        }
    </style>
</head>
<body>
    <div class="box">
    </div>
</body>
</html>